1 [ril]
a small rivulet or brook.

1530–40; < Dutch or Low German; compare Frisian ril Unabridged


2 [ril]
noun Astronomy.
any of certain long, narrow, straight or sinuous trenches or valleys observed on the surface of the moon.
Also, rille.

1885–90; < German Rille; see rill1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rill (rɪl)
1.  a brook or stream; rivulet
2.  a small channel or gulley, such as one formed during soil erosion
3.  Also: rille one of many winding cracks on the moon
[C15: from Low German rille; related to Dutch ril]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"small brook, rivulet," 1538, from Du. ril, Low Ger. rille "groove, furrow, running stream," probably from P.Gmc. *riðele (cf. O.E. rið, riþe "brook, stream," which survives only in obscure Eng. dialects), a diminutive form from PIE base *reie- "to run, flow" (see Rhine).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In the countryside, tacky taco emporiums are effacing copses and rills and
  hallowed ground.
Tiny rills are quickly carved into the soft mudstone.
Rills are rather large and deep, so they are difficult to reclaim by simple
  tillage and they are readily noticeable.
Rills are small channels formed on the surface of the slope.
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